Iota IQ4 4-Stage Battery Bank Charging Control


  • 4-stage battery charging control for DLS chargers
  • Works with 12V or 24V Iota DLS chargers
  • Maintains batteries during long-term storage
  • Automatically adjusts charge setting to battery needs


The IQ4 Smart Controller provides intelligent automatic charging control for your DLS Battery Charger, keeping batteries fully charged and operating for long life. IQ4 Charge Controllers are available for any DLS Battery Charger model and are backed by the IOTA Two-Year Warranty. For 4-Stage charging use the external IQ4 pendant or order a DLS charger with a built-in IQ4 control.

The IQ4 Charge Controller allows the DLS Series battery charger to operate as an automatic “smart charger”, delivering the charge your battery needs at the time it needs it. The IQ4 uses four different charging modes to keep your battery in peak condition.


The Bulk Stage of the IQ4 allows the batteries to be charged from the full rated output of the charger (for example, a 12V charger will charge at a maximum of 14.8V). This increased charging period reduces the overall charging time of the battery.


After the Bulk Stage, the IQ4 then moves to the Absorption Stage (14.2V for a 12V battery, 24.4V for 24V battery). This mode will continue for up to 480 minutes (8 hours) to ensure that the battery receives a complete charge.


During the Float Stage, the IQ4 reduces the DLS charge voltage. This reduced voltage maintains the full charge while minimizing ‘gassing’ of the battery. The IQ4’s float stage prevents boiling and bulging of the battery caused when the battery is exposed to higher charging voltages for too long.


If the batteries remain in a “float stage” for a seven-day period, the IQ4 will switch the DLS charger into a pre-programmed Equalization Stage. This protects the life of your battery by dissolving any sulfate layer on the battery’s internal plates and avoids stratification that can occur when a battery has not been in use for extended periods.

The Eqaulization stage only reaches up to 14.8V for 12V, 29.6V for 24V, for 15-20 minutes. Will not adversly affect SLA batteries.

Generally the IQ4 is no longer voltage specific for 12-42 volt DC output IOTA DLS units. The IQ-4 will read the number of cells when first connected and adjust itself to the voltage of the battery bank. The DLS54-13 though requires a special IQ-4 model. If you need the 54 volt model IQ-4, please see the IQ4-54V on our web store.

NOTE: Please check with us or IOTA before using these on older IOTA units as they may not be compatible and could damage older models!

Do not use an IQ4 if connecting your DLS chargers in Series. You will have manually adjust voltage with the dual voltage jack.

For Parallel synchronization of two DLS units please see the IQ4-Parallel.

Typically in stock at our Alaska and Washington locations.

Additional information

Weight0.5 lbs


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